import { constantRoutes } from "@/router";
import { getRouters } from "@/api/menu";
import Layout from "@/layout/index";
import router from "../../router";


const permission = {
    state: {
        routes: [],
        addRoutes: [],
        activeMenu: {}
    },
    mutations: {
        SET_ROUTES: (state, routes) => {
            state.addRoutes = routes
            state.routes = constantRoutes.concat(routes)
        },
        SET_ACTIVEMENU: (state, activeMenu) => {
            state.activeMenu = activeMenu
        }
    },
    actions: {
        // 生成路由
        GenerateRoutes({ commit }) {
            return new Promise(resolve => {
                // 向后端请求路由数据
                getRouters().then(res => {
                    const accessedRoutes = filterAsyncRouter(res.data);
                    // accessedRoutes.push({ path: '*', redirect: '/404', hidden: true })
                    commit('SET_ROUTES', accessedRoutes);
                    resolve(accessedRoutes);
                })
            })
        },
        // 设置当前显示的菜单
        SetActiveMenu({ commit }, activeMenu) {
            commit('SET_ACTIVEMENU', activeMenu);
        }
    }
}

// 遍历后台传来的路由字符串，转换为组件对象
function filterAsyncRouter(asyncRouterMap) {
    return asyncRouterMap.filter(route => {
        if (route.component) {
            // Layout组件特殊处理
            if (route.component === 'Layout') {
                route.component = Layout
            } else {
                route.component = loadView(route.component)
            }
        }
        if (route.children != null && route.children && route.children.length) {
            route.children = filterAsyncRouter(route.children)
        }
        return true
    })
}

export const loadView = (view) => { // 路由懒加载
    return (resolve) => require([`@/views/${view}`], resolve)
}

export default permission